I know that sometimes Uranus on the Ascendant can give height; it has in my case, I'm 5'9"...but I also know others with this aspect who aren't tall, so...?
FWIW...
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We have to look at individual charts and the aspects to the ascendant. The decans are also important. Aquarius, Sagittarius and Gemini can be tall signs. Jupiter connected to the ascendant. The ruling planet etc. and aspects. I have Pisces rising in the 1st degrees Pisces decan and am just average height 5'4" and with Neptune ruling in Libra I am curvy.
I have a friend with Sagittarius rising and Jupiter there in the 1st. Classic for height you would think. She is very short and not a big build.
I have two sisters who are 5'9" and no idea why they are taller... Different rising, sun and moon signs..I think the Moon plays a part in heredity and Sun is our basic constitution.
Two taller than average cousins but with a short mother and average height father.
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It is complex and involves heredity factors etc.